Difference between revisions of "RC meeting and Run Plan, Tuesday Nov 22"

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* HGC work completed (B. Sawatzky, University Regina). Aerogel change completed (Vladimir et al). Roof beams on SHMS replaced.
 
* HGC work completed (B. Sawatzky, University Regina). Aerogel change completed (Vladimir et al). Roof beams on SHMS replaced.
 
* Brush installation attempt will be made along with rail cleaning (Wed), W. Kellner et al.
 
* Brush installation attempt will be made along with rail cleaning (Wed), W. Kellner et al.
−
* Vacuum studies (W. Kellner)
+
* Vacuum studies (W. Kellner et al)
 
* Accelerator division plan beam delivery testing Wed 11/28 swing shift and physics beam Thursday 11/29
 
* Accelerator division plan beam delivery testing Wed 11/28 swing shift and physics beam Thursday 11/29
 
* Lock up during day shift 11/28 - current plan is to have all work finished, all checkouts completed by 2pm
 
* Lock up during day shift 11/28 - current plan is to have all work finished, all checkouts completed by 2pm

Revision as of 21:52, 27 November 2018

RC Meeting Information

RC Daily Meetings are at 4:30 PM, 2nd floor Counting House Meeting Room

  • Bluejeans remote connection information:
 To join the Meeting:
 https://bluejeans.com/861439920
 To join via Room System:
 Video Conferencing System: bjn.vc -or-199.48.152.152
 Meeting ID : 861439920
 To join via phone :
 1)  Dial:
   +1.408.740.7256 (US (San Jose))
   +1.888.240.2560 (US Toll Free))
   +1.408.317.9253 (US (Primary, San Jose))
   (see all numbers - http://bluejeans.com/numbers)
 2)  Enter Conference ID : 861439920

Useful Links

Current Status

  • Hall is in restricted access
  • Work is on-going in Hall yesterday, today and tomorrow. Please coordinate work plans with W. Kellner, and let the RC know.
  • HGC work completed (B. Sawatzky, University Regina). Aerogel change completed (Vladimir et al). Roof beams on SHMS replaced.
  • Brush installation attempt will be made along with rail cleaning (Wed), W. Kellner et al.
  • Vacuum studies (W. Kellner et al)
  • Accelerator division plan beam delivery testing Wed 11/28 swing shift and physics beam Thursday 11/29
  • Lock up during day shift 11/28 - current plan is to have all work finished, all checkouts completed by 2pm
  • Will get update if this schedule still stands tomorrow at MCC meeting

Current Run Plan

Notices in Effect for Shift Crew

  • Please note the latest changes to shift schedule and stay tunes for any more updates.
  • TO on for all shifts. SL cancelled until Wednesday 11/28 swing shift. SL for Wednesday 11/28 swing and Thursday 11/29 owl shifts are on standby. Please be ready to come to shift if required. Currently all shifts from Thursday 11/29 day are as originally planned.

Current Issues

  • Coincidence time resolution issue. Studies still on-going, part of the story explained by switched polarity of reference time signals. See log entry by E. Pooser: https://logbooks.jlab.org/entry/3632238.
  • JT valve issue on loop 3 is solved. LD2 target is parked now. (D. Meekins)
  • S. Lassiter, J. Segal, Ethan currently working on drive controller issue and remote control for SHMS magnet power supplies. Update: if driver controller issue does happen we will *still need local reset of shunt trip breakers* for safety. New HMS rotation electric motors installed and working well. A UPS was installed to avoid brown out issues we observed. There is also an update from S. Lassiter on moving from ~20 degrees to higher angles with HMS.HMS over-revs at around 21 degrees giving error "E07.4 DC Bus overvoltage" at which point user must press stop or the shunt trip breakers will need a local re set.
  • HMS dipole, currently S. Lassiter, J. Segal, Ethan cannot get the HMS dipole to ramp up to 2000A without tripping. Below 1900A is ok. Since maximum p_HMS for Kaon LT before shut down at end of year is -4.371GeV/c. If higher p_HMS required during running early in 2019, this issue should be worked on during winter shut down.
  • HMS angle camera was reset (B. Sawatzy). Target view would require new camera.

Planned Accesses to the Hall

  • We are in restricted access until 2pm tomorrow Wed 11/28. Coordinate any work with W. Kellner.

Planned Accelerator Configuration Changes

  • Currently down for energy change to 1.86 GeV/pass and move to 500 MHz laser. Accelerator division beam studies on-going. Update on schedule will be given tomorrow morning.

Special Requests

  • PD has been alerted that a super harp scan is required when beam is back. PD has also been alerted that an energy determination with arc measurement is needed (preferably Friday). PD will pass requests on to the next PD, who takes over tomorrow.
  • PD was asked if J. Benesch requires to do a beam steering study after beam on. This will determine what angles we set spectrometers at during lock up.
  • Since Hall A running is done, this RC daily meeting time could be moved earlier from 4:00pm on if it works better for participants' schedules
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